X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mm%2Fsparse.c;h=e0a3fe48aa3745bebd710ff80d8cad6215dd244d;hb=92445eaaadc1f03f5a177ecc957bda76bf2ba8d5;hp=d7c32de99ee8c49d0e850a06084d5efe508a7625;hpb=2bf9d6d0f2dadc2a6c13684719c67dc043b9ce67;p=linux-2.6

diff --git a/mm/sparse.c b/mm/sparse.c
index d7c32de99e..e0a3fe48aa 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -32,7 +32,7 @@ static struct mem_section *sparse_index_alloc(int nid)
 	unsigned long array_size = SECTIONS_PER_ROOT *
 				   sizeof(struct mem_section);
 
-	if (system_state == SYSTEM_RUNNING)
+	if (slab_is_available())
 		section = kmalloc_node(array_size, GFP_KERNEL, nid);
 	else
 		section = alloc_bootmem_node(NODE_DATA(nid), array_size);
@@ -87,11 +87,8 @@ int __section_nr(struct mem_section* ms)
 	unsigned long root_nr;
 	struct mem_section* root;
 
-	for (root_nr = 0;
-	     root_nr < NR_MEM_SECTIONS;
-	     root_nr += SECTIONS_PER_ROOT) {
-		root = __nr_to_section(root_nr);
-
+	for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) {
+		root = __nr_to_section(root_nr * SECTIONS_PER_ROOT);
 		if (!root)
 			continue;
 
@@ -102,6 +99,22 @@ int __section_nr(struct mem_section* ms)
 	return (root_nr * SECTIONS_PER_ROOT) + (ms - root);
 }
 
+/*
+ * During early boot, before section_mem_map is used for an actual
+ * mem_map, we use section_mem_map to store the section's NUMA
+ * node.  This keeps us from having to use another data structure.  The
+ * node information is cleared just before we store the real mem_map.
+ */
+static inline unsigned long sparse_encode_early_nid(int nid)
+{
+	return (nid << SECTION_NID_SHIFT);
+}
+
+static inline int sparse_early_nid(struct mem_section *section)
+{
+	return (section->section_mem_map >> SECTION_NID_SHIFT);
+}
+
 /* Record a memory area against a node. */
 void memory_present(int nid, unsigned long start, unsigned long end)
 {
@@ -116,7 +129,8 @@ void memory_present(int nid, unsigned long start, unsigned long end)
 
 		ms = __nr_to_section(section);
 		if (!ms->section_mem_map)
-			ms->section_mem_map = SECTION_MARKED_PRESENT;
+			ms->section_mem_map = sparse_encode_early_nid(nid) |
+							SECTION_MARKED_PRESENT;
 	}
 }
 
@@ -167,6 +181,7 @@ static int sparse_init_one_section(struct mem_section *ms,
 	if (!valid_section(ms))
 		return -EINVAL;
 
+	ms->section_mem_map &= ~SECTION_MAP_MASK;
 	ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum);
 
 	return 1;
@@ -175,8 +190,8 @@ static int sparse_init_one_section(struct mem_section *ms,
 static struct page *sparse_early_mem_map_alloc(unsigned long pnum)
 {
 	struct page *map;
-	int nid = early_pfn_to_nid(section_nr_to_pfn(pnum));
 	struct mem_section *ms = __nr_to_section(pnum);
+	int nid = sparse_early_nid(ms);
 
 	map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION);
 	if (map)